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UNITED STATES PATENT OEETCE.

WILLIAM R. FOX, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO THE FOX MACHINE COMPANY, OF SAME PLACE.

SASH-PU LLEY.

SPECIFICATION forming part of Letters Patent No. 506,684, dated October 17, 1893.

I Application tiled January 19, 1893. Serial No. 458,933. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM R. FOX, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Sash-Pulleys, of which the following is a specication.

My invention relates to sash pulleys of that class in which the pnlleyis pivoted in a shell, and the whole adapted to be inserted in a cavity in the casing.

The invention consists in the special construction of the shell and in the means for supporting and pivoting the pulley therein. It is illustratelin the accompanying drawings, in whichv Figure 1, shows the device in side elevation. Fig. 2, is a front view of a section of a casing, with the holes bored to form the recess for the pulley shell. Fig. 3, is a front elevation of the pulleyin place in the casing. Fig. 4, represents a section on line of Fig. 1. Fig. 5, shows the form of the sheetv durability-and facility in Iitting into place,`

together with neatness of appearance, and security when in place, without the aid of screws or nails. For these purposes I have selected at the outset sheet metal (preferably sheet steel) of the general characteristics, as those shown in the United States patent of Thompson of September 19, 1871. The side walls of my casing are formed as in that patf ent by bending the wings of the metal blank on each side of Ithe central face part, to positions at right angles to said face. The thin sheet metal however, forms a comparatively weak wall, and, in order to strengthen it, and at the same time to tit it to a recess formed by boxing, I corrugate the wings, on linesat right angles tothe plane of the face. Further, in order to secure the shell in the casing I form the walls plain at the ends, whereby they are fitted to cut into the wood, and thus hold the shell in place, without the ears such as those shown in the aforesaid patent of Thompson. The corrugations are located between 5o these plain ends, and are so proportioned to the transverse dimensions of the shell, across its face, that they will lit holes bored to intersect in the casing to form the mortise for the pulley and shell. Anexterior form of the walls, shaped to it bit-holes, however, is not new, having been shown in the United States patent of Vetterlein. of December 12, 1876. But, by forming the sheet metal walls in corrugations the metal is strengthened, andthe t to the bit-holes secured at the same time. Further, the interior crests or ridges, -between the swells being near the planes ot' the sides of the pulley, form the guiding faces for said pulley. As the construction requires no perforated ears at the ends of the face,aconsid erable percentage of metal is saved, in the manufacture. v

Referring to the drawings the blank from which the shell is formed is shown in Fig. 5, the central part bounded by the lines 2--2 forming the face of the shell and in it is the slot 3, for the pulley. The wings b-b are preferably cut to conform approximately to the contour of the pulley, but the curve does not start on the line 2`2, but outside that line, so as to leave straight edges h', b', at the ends and corners c, shown in Fig. 1. The wings are bent to the position shown in Fig. 4. They are formed with corrugations 4, 4, on each side and with interior crests or ridges 5, between the swells or corrugations 4. The

form shown is in proper proportion with two swells on each side, and three interior crests in Ythe center. The holes 7, for the rivet which connects the walls and forms thejournal for the pulley, are on the line of these central crests, so that the walls at those points are near to the pulley. 'lhese walls also at the ends or corners c, are plain and are fitted to cut directly into the Wood. The recess for the shell is formed, as heretofore, by fo'ur holes bored through or into the casing, forming a cavity in length equal to the length of the face of the shell. The recess is therefore rounded at the ends. When the shell is inserted, the swells on each side tit the two bit-formed grooves, but the corners c, being formed of the straight or plain walls, cut into the wood, as shown in Fig. 3. These four corners are thin enough to admit being IOO driven in, and form a holding device as secure as screws and better than ears formed on the ends for screws or nails, as heretofore.

In order to connect and sustain the walls and support the pulley I provide a rivet and quill bushing. The wheel shown is made of sheet metal and has a bearing sleeve E, but this may represent the bearing of any kind of Wheel. Looking at Fig. 4, the quill sleeve 1s seen at D. It may be made of sheet metal, preferably steel, and is of a length fitted to act as a strut and prevent the walls from collapsing. Preferably the walls are formed with depressions about the holes 7. These make interior plain bearing faces for the ends of the sleeve, close about the holes. When 1n place a plain rivet C, is inserted and headed down. The use of the sleeve obviates the necessity of shoving the Walls apart in puttlng in a rivet with the ends turned down to form shoulders and the plain rivet and sleeve are much cheaper. The sleeve forms the bearing as well as distance piece between the walls.

In cast metal shells, having an exterior tinted or corrugated surface, the shell, as a matter of course, is rigid and it is not possible practically to make them of exactly the same size, or true outline or smooth, and as they are rigid, they cannot adjust themselves to the recess in the jamb. But the shell formed out of sheet metal, and in dies, may be made accurately and of perfectly uniform dlmensions and of smooth surface. They may thus be driven tightly in the recess, and by their elasticity the corrugated Wings fit themselves to the corresponding walls of the recess, and fit snugly with strong frictional contact, so that all the strain upon the pulley is transmitted to the Walls of the recess in the Jamb. The sheet metal casing should also be fitted to be driven more tightly since it may be so driven, by reason of its smoothness. lhe rivet has also a tendency to hold the shell 1n the recess, by reason of the shell being slightly yielding and having the greatest Width at the rivet, and thus the shell is effectually prevented from going either way. The thin edges also of the sheet metal, may enter the wood, which is not practicable in cast metal forms.

In the manufacture of such articles as pulleys and their casings made in large quantities a very small saving is of great importance, and this kind of saving is effected in the sleeve which is not only cheaply made, as it may be rolled up from the same kind of sheet steel as that of the shell,` but it also acts as a strut as well as a bearing, and by holding a part of the walls or wings, holds also the shell more rmly in place.

I claim- 1. A shell for sash pulleys composed of a single piece of metal consisting of corrugated Wings extending parallel to each other connected by an uncorrugated face plate having an elongated central opening for the pulley, substantially as described.

2. A shell for sash pulleys composed of a single piece of sheet metal consisting of wings and a face plate, said wings having plainl ends adapted to cut into the wood and corrugations intermediate of said plain ends, substantially as described.

3. In combination with the shell having openings in itssides,arivet extending through the openings and having its ends upset against the Walls of the shell, a hollow bushing of uniform diameter surrounding the rivet and bearing against the face of the shell walls to prevent inward movement thereof and apulley mounted on the bushing, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM R. FOX.

Witnesses:

JOHN DUFFY, EARL STOKOE. 

